PlainIndex
Menu

ETF comparison

AGG vs SPAB

Both US Aggregate Bond.

iShares Core U.S. Aggregate Bond ETF · State Street SPDR Portfolio Aggregate Bond ETF

Holdings overlap

Weighted by ISIN/CUSIP
56.2 %

6,834 positions appear in both funds. Buying equal dollars of AGG and SPAB would leave roughly 56.2% of each dollar exposed to the same underlying securities.

AGG only 42.8% Shared 56.2% SPAB only 42.9%
In AGG only
6,349 positions
Shared
6,834 positions
In SPAB only
1,494 positions

Side by side

AGG

iShares Core U.S. Aggregate Bond ETF

iShares · US Aggregate Bond

89 composite / 100
Expense ratio
0.030%
Net assets
$138.85B
TTM yield
4.01%
Top-10 conc.
7.1%
SPAB

State Street SPDR Portfolio Aggregate Bond ETF

State Street · US Aggregate Bond

89 composite / 100
Expense ratio
0.030%
Net assets
$9.63B
TTM yield
4.08%
Top-10 conc.
9.3%

Sub-score comparison

97
Cost
97
52
Tax efficiency
52
100
Liquidity
99
100
Concentration
100
—
Tracking quality
—
AGG sub-score SPAB

Tracking quality isn't part of the composite — see what we don't score for why.

Cost difference

Expense ratios are effectively identical (0.030% vs 0.030%).

Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with AGG vs SPAB.

Top shared holdings

6,834 shared in total
# Holding In AGG In SPAB Overlap
1 United States Treasury 0.42% 0.42% 0.42%
2 United States Treasury 0.42% 0.39% 0.39%
3 United States Treasury 0.39% 0.37% 0.37%
4 United States Treasury 0.41% 0.37% 0.37%
5 United States Treasury 0.39% 0.37% 0.37%
6 United States Treasury 0.40% 0.36% 0.36%
7 United States Treasury 0.41% 0.36% 0.36%
8 United States Treasury 0.42% 0.35% 0.35%
9 United States Treasury 0.35% 0.34% 0.34%
10 United States Treasury 0.41% 0.33% 0.33%
11 United States Treasury 0.46% 0.30% 0.30%
12 United States Treasury 0.29% 0.30% 0.29%

Only in AGG

6,349 total
  • BlackRock Funds III 0.52%
  • United States Treasury 0.27%
  • UMBS, TBA 0.22%
  • United States Treasury 0.21%
  • UMBS, TBA 0.21%
  • United States Treasury 0.20%
  • United States Treasury 0.19%
  • United States Treasury 0.18%
  • United States Treasury 0.18%
  • UMBS, TBA 0.17%

Only in SPAB

1,494 total
  • State Street Global Advisors 1.15%
  • UMBS, TBA 0.38%
  • Government National Mortgage Association 0.36%
  • United States Treasury 0.29%
  • United States Treasury 0.29%
  • Government National Mortgage Association 0.26%
  • Freddie Mac 0.22%
  • Freddie Mac 0.21%
  • Freddie Mac 0.19%
  • UMBS, TBA 0.19%

Open AGG or SPAB at a brokerage

Both funds trade commission-free at major US brokerages.

Open at Fidelity

Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.

Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see /methodology/.

Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.